Oskar nagel



UNITED STATES PATENT OFFICE.

OSKAR NAGEL, OFVIENNA, AUSTRIA-HUNGARY.

MANUFACTURE OF COMPOUNDS OF PYROXYLIN.

SPECIFICATION forming part of Letters Patent No. 596,662, dated January4, 1898. Application filed February 3 1896. $eria1 No. 577,942- (Nospecimens.)

To all whom it may concern.-

Be it known that I, OSKAR NAGEL, a subject of the Emperor ofAustria-Hungary, residing at Vienna, Austria-Hungary, have invented acertain new and useful Improvement in the Manufacture of Compounds ofPyroxylin, of which the following is a specification.

My invention relates to the manufacture of compounds'of pyroxylin by theuse of a new solvent for nitrocellulose, which acts substantially inthe'same manner as does gum-camphor I have discovered that thecrystalline body formed by passing dry hydrochloric-acid gas through dryturpentine may be employed as a solvent for nitrocellulose either justas it is produced by passing the gas through the turpentine or after ithas been subsequently treated to remove the hydrochlorid. Thecrystalline body produced by passing dry hydrochloric-aoid gas throughanhydrous turpentine is known as hydrochlorinated turpene, (C H HGL) Thebody O H remaining after the hydrochlorid has been distilled 01f, as bythe use of lime, is known as camphene. Either of these bodies may beused as a solvent for nitrocellulose in the same manner. Persons skilledin the art of producing pyroxylin compounds will readily understand themanner of working this solvent with pyroxylin, as there is no essentialdiiference between it and the mode of working gum-oamphor. However, asan example I will state that I prefer to dissolve the nitrocellulose ina suitable solventas, for instance, ethyl alcohol and etherin theproportions usually employed for dissolving nitrocellulose inthe'manufacture of pyroxylin compoundsthat is to say, two parts of ethylalcohol and eight parts of ether to dissolve ten parts of pyroxylin, allby weight. When the pyroxolin has been thoroughly dissolved, I addthereto in the usual way five parts, or about half of the weight of thepyroxylin, of the hydrochlorinated turpene or camphene. The compound maythen be worked in the ordinary way to convert it intoa solid mass. Ineed not describe the mode of doing this, as it is well-known in theart. 1

I may also combine my new solvent with the nitrocellulose or pyroxylinby what is known as the dry process. In so doing I employ ten parts ofpyroxylin to about half that weight of camphene or hydrochlorinatedturpene. This is done by mixing the'bodies while in a ground state andthen subjecting them to heat and pressure, whereby the turpene chloridor camphene becomes a solvent without the aid of a liquid menstruum.

It will be understood by those skilled in the art that thehydrochlorinated turpene or the camphene may first be dissolved by anysuitable solventas, for instance, the ethyl alcohol and ether abovementioned--and the nitrocellulose then added and that any of the knownsolvents for nitrocellulose or camphor may be employed. In fact mynewly-discovered solvent may be employed as a substitute for camphor inany of the known ways of using camphor for nitrocellulose, and thehydrochlorinated turpene and camphene may be mixed together and used asa solvent.

I'have not found it necessary to add gumcamphor to aid the action of mynewly-discovered solvent; but the addition of the same, if one choosesto add it, does not harm the product or interfere with the action of mysolvent.

Iclaim- 1. The process of manufacturing pyroxylin compounds consistingof combining with nitrocellulose, a solvent consisting of thecrystalline product produced by passing hydrochloric-acid gas throughturpentine, substantially as set forth.

2. The process of manufacturing pyroxylin compounds consisting ofcombining with nitrocellulose the hydrochlorinated turpene (O I-I HOl)or camphene (C H as a solvent, substantially as set forth.

3. The process of manufacturing pyroxylin compounds consisting ofcombining with nitrocellulose hydorchlorinated turpene (G H H01) orcamphene (C H as a solvent in connection with a liquid menstruum,substantially as set forth.

This specification signed and witnessed this 1st day of February, 1896.

OSKAR NAGEL.

Witnesses:

EUGENE CONRAN, J OHN RTAYLOR.

